Sausage Peppers Spaghetti Squash

Roasted spaghetti squash strands mixed with savory Italian sausage and colorful bell peppers in tomato sauce for a bubbling casserole. Save to Pinterest
Roasted spaghetti squash strands mixed with savory Italian sausage and colorful bell peppers in tomato sauce for a bubbling casserole. | freshforklab.com

This comforting dish layers tender roasted spaghetti squash strands with browned Italian sausage and sautéed bell peppers, all simmered in a rich tomato sauce. Topped with melted mozzarella and Parmesan, then baked until golden and bubbly, it's a wholesome, low-carb meal perfect for any night. Fresh herbs add a final touch of brightness.

The first time I served this at a dinner party, my friend leaned over and whispered 'I promise I'm not eating healthy, this is just good.' That's when I knew this recipe was a keeper. It happened during one of those chilly October evenings when everyone wanted comfort food but nobody wanted the heavy carb coma that usually follows.

I discovered this during my 'try to eat somewhat better' phase, which honestly lasted about three weeks until I found ways to make healthier food taste just as indulgent as the real thing. Now this casserole appears on our dinner table at least twice a month, usually when my husband requests 'that fake pasta thing' with the most endearing look in his eyes.

Ingredients

  • Spaghetti Squash: Pick one that feels heavy for its size with a hard, unblemished skin. The weight means more flesh to transform into those amazing noodles.
  • Italian Sausage: Remove the casings and let the meat crumble into the sauce. I alternate between mild and hot depending on who's coming to dinner.
  • Bell Peppers: Use both red and yellow for sweetness. One red and one yellow pepper creates the prettiest flecks of color throughout the dish.
  • Marinara Sauce: Your favorite jarred brand works perfectly here. I add a pinch of sugar if it tastes too acidic, which balances everything beautifully.
  • Mozzarella and Parmesan: The mozzarella creates those irresistible cheese pulls while Parmesan adds the salty depth that makes each bite sing.

Instructions

Roast the Squash:
Cut the spaghetti squash in half lengthwise. Scoop out the seeds. Brush the cut sides with 1 tablespoon olive oil and season with salt and pepper. Place squash halves cut-side down on a baking sheet lined with parchment paper. Roast at 400°F for 35-40 minutes, until tender and strands easily pull away with a fork.
Brown the Sausage:
While the squash roasts, heat the remaining olive oil in a large skillet over medium heat. Add the sausage. Cook, breaking it up with a spoon, until browned and cooked through, about 6-7 minutes.
Soften the Vegetables:
Add onions and bell peppers to the sausage. Sauté for 5 minutes until softened. Stir in garlic, oregano, basil, and red pepper flakes. Cook 1 minute more until fragrant.
Simmer the Sauce:
Pour in the marinara sauce. Simmer for 5 minutes, then remove from heat. The sauce should thicken slightly and coat the sausage mixture beautifully.
Scrape the Squash:
Once the squash is cool enough to handle, use a fork to scrape the flesh into spaghetti-like strands. Discard the skins. This part feels like magic every single time.
Combine Everything:
Reduce oven temperature to 375°F. In a large mixing bowl, combine squash strands, sausage mixture, half the mozzarella, and half the Parmesan. Mix well and season to taste.
Bake to Perfection:
Transfer mixture to a greased 9x13-inch baking dish. Top with remaining mozzarella and Parmesan. Bake uncovered for 15-20 minutes, until bubbly and golden. Let rest 5 minutes before garnishing with fresh basil and serving.
Baked Sausage and Peppers Spaghetti Squash Casserole topped with melted mozzarella and fresh basil leaves on a white dish. Save to Pinterest
Baked Sausage and Peppers Spaghetti Squash Casserole topped with melted mozzarella and fresh basil leaves on a white dish. | freshforklab.com

Last winter, my sister declared she'd never eat low-carb pasta again until I served her this bubbling from the oven. She took one hesitant bite, sat up straighter, and asked for seconds. Now she texts me every Sunday asking if I'm making 'that squash thing' for dinner that week.

Make It Your Own

This casserole welcomes substitutions like an old friend. I've used mushrooms instead of sausage for vegetarian guests, tossed in spinach during the last few minutes of vegetable sautéing, and even added a layer of ricotta cheese for extra creaminess. The formula stays the same, but the possibilities keep it interesting.

Timing Strategy

The most efficient workflow starts with roasting the squash, then using that 40-minute window to prepare everything else. By the time the squash is cool enough to handle, your sausage mixture will be ready, and assembly becomes a quick affair rather than a prolonged process.

Serving Suggestions

A crisp green salad with vinaigrette cuts through the richness beautifully. I also love crusty bread on the table for those who want a few traditional bites alongside their squash noodles. Something about the combination feels perfectly balanced.

  • Freeze unbaked portions for busy weeknight emergencies
  • Double the recipe and bake in two separate dishes
  • The flavors deepen overnight, making it excellent meal prep
Hearty low-carb Sausage and Peppers Spaghetti Squash Casserole served family-style with golden cheese crust and vibrant pepper pieces throughout. Save to Pinterest
Hearty low-carb Sausage and Peppers Spaghetti Squash Casserole served family-style with golden cheese crust and vibrant pepper pieces throughout. | freshforklab.com

There's something deeply satisfying about serving comfort food that leaves everyone feeling nourished rather than weighed down. This recipe has become my go-to for proving that delicious and nutritious can absolutely coexist on the same fork.

Recipe FAQs

Slice the squash lengthwise, scoop out seeds, brush with olive oil, season, and roast cut-side down at 400°F until tender, about 35-40 minutes.

Yes, mild, hot, or plant-based sausages all work. Adjust cooking time as needed to brown evenly.

Choose gluten-free marinara sauce and sausage to keep the dish free of gluten.

Once roasted and cooled, scrape the flesh with a fork to separate strands that resemble spaghetti.

Yes, assemble it ahead and bake when ready to serve for convenience.

Sausage Peppers Spaghetti Squash

A savory blend of spaghetti squash, Italian sausage, and bell peppers in a flavorful baked dish.

Prep 25m
Cook 50m
Total 75m
Servings 4
Difficulty Easy

Ingredients

Vegetables

  • 1 large spaghetti squash, about 3 pounds
  • 1 red bell pepper, sliced
  • 1 yellow bell pepper, sliced
  • 1 small yellow onion, thinly sliced
  • 2 cloves garlic, minced

Meats

  • 12 ounces Italian sausage, mild or hot, casings removed

Sauces & Dairy

  • 1 1/2 cups marinara sauce, gluten-free if needed
  • 1 cup shredded mozzarella cheese
  • 1/4 cup grated Parmesan cheese

Pantry & Seasonings

  • 2 tablespoons olive oil
  • 1/2 teaspoon dried oregano
  • 1/2 teaspoon dried basil
  • 1/4 teaspoon crushed red pepper flakes
  • Salt and freshly ground black pepper to taste
  • Fresh basil for garnish

Instructions

1
Prepare the Squash for Roasting: Preheat oven to 400°F. Line a baking sheet with parchment paper. Cut spaghetti squash in half lengthwise and scoop out seeds. Brush cut sides with 1 tablespoon olive oil and season with salt and pepper. Place squash halves cut-side down on prepared baking sheet.
2
Roast the Squash: Roast squash for 35 to 40 minutes until tender and strands easily pull away with a fork.
3
Cook the Sausage: While squash roasts, heat remaining olive oil in a large skillet over medium heat. Add sausage and cook, breaking up with a spoon, until browned and cooked through, about 6 to 7 minutes.
4
Sauté Vegetables: Add onions and bell peppers to the skillet. Sauté for 5 minutes until softened. Stir in garlic, oregano, basil, and red pepper flakes. Cook 1 minute more until fragrant.
5
Add Sauce and Simmer: Pour marinara sauce into the skillet. Simmer for 5 minutes to combine flavors, then remove from heat.
6
Prepare Squash Strands: Once squash is cool enough to handle, use a fork to scrape flesh into spaghetti-like strands. Discard the skins. Reduce oven temperature to 375°F.
7
Combine Filling: In a large mixing bowl, combine squash strands, sausage mixture, half the mozzarella, and half the Parmesan. Mix well and season to taste.
8
Assemble Casserole: Transfer mixture to a greased 9x13-inch baking dish. Top with remaining mozzarella and Parmesan cheeses.
9
Bake Until Golden: Bake uncovered for 15 to 20 minutes until cheese is melted, bubbly, and golden brown.
10
Rest and Serve: Let casserole rest for 5 minutes before garnishing with fresh basil and serving.
Additional Information

Equipment Needed

  • Sharp chef's knife
  • Baking sheet
  • Large skillet
  • Large mixing bowl
  • 9x13-inch baking dish
  • Wooden spoon or spatula

Nutrition (Per Serving)

Calories 390
Protein 25g
Carbs 22g
Fat 23g

Allergy Information

  • Contains dairy (mozzarella, Parmesan)
  • Contains pork unless using chicken, turkey, or vegetarian sausage
  • Gluten-free when using gluten-free marinara and sausage
  • Always check ingredient labels for hidden allergens
Natalie Chen

Sharing easy, flavorful recipes and kitchen tips for everyday cooks and food lovers.